Content-Type: multipart/signed;
 boundary="--==_mimepart_649194c00_140d32260708d4";
 micalg=pgp-sha1;
 protocol="application/pgp-signature"
Content-Transfer-Encoding: 7bit

This is an OpenPGP/MIME signed message (RFC 3156)
----==_mimepart_649194c00_140d32260708d4